In its most fundamental definition, a digital garden is a collection of notes taken on an electronic medium.
Gardening became very entangled with the Zettelkasten method, which was popularized, perhaps, with the book How to Take Smart Notes. Although The Luhmann method was born around a static medium such as paper, today we have available other support media, that lead to evergreen notes, i.e. infinitely editable, improvable, and linkable notes.
Editing notes, finding new links and checking the merging structure became known as Tendering a digital garden. Perhaps it's from here that the nickname evolved. See also: leveraging the digital medium for better note taking.
Gardens for Inspiration
Some gardens that acted as inspiration while building this website. It is worth mentioning that over time, I simply stopped checking them.
These are the other notes that link to this one.